Tube Amp Archive

I'll definitely give that a try. Out of curiosity what is the purpose? So they are both referenced to the same ground voltage?

Chris

After a little more trimming and moving things around in the amp I think I've gotten it to the point where I can consider it a success. Still a little 60Hz hum in there, but it's doubtful I will eliminate it all with the amount of gain this thing has. And as long as I stay more then about 2 feet fro...

After some playing around inside, such as removing a ground from the input jack, adding lead weights to the bottom of the chassis, swapping tubes some more and moving a few wires around I think I've gotten rid of most of the squealing. I can still just barely hear a hint of a high frequency, almost ...

The tail resistor is 10k and the FB is 100k, like in the schematic. Presence pot is also 5k. What do I need to do to check the caps? Look for AC or DC voltage on one side where it shouldn't be? The switch to the right switches the OT primaries between 5200/6600 ohms and the one to the left is for th...

Here's an update. So far I redid the treble wire as recommended, making it shorter and routed very similarly to Francesca. Also changed the V1b wire from the volume to the tube to shielded. Lengthened the mid/base wires and ran them parallel under the pots. Also, I should add that I tried putting th...

Thanks for the replies guys! I'll definitely try the things you've suggested. So far I had already reversed the OT primaries to get it to the point it's at now. It was worse before. Also, I just bought an oscilloscope off eBay, so if I don't have any luck with the things suggested, that will maybe h...

This isn't what I was hoping to have as my first post here, but I knew I wasn't lucky enough to complete this build without any problems. I'm getting an odd squealing out of the amp, that doesn't sound microphonic. With no input as I touch the amp chassis I can hear a little pop, and as I do anythin...